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Date: Wed, 10 Mar 2021 17:54:18 -0700 From: Nathan Chancellor <nathan@...nel.org> To: Russell King <linux@...linux.org.uk>, Nick Desaulniers <ndesaulniers@...gle.com>, Arnd Bergmann <arnd@...db.de> Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com, Nathan Chancellor <nathan@...nel.org> Subject: [PATCH] ARM: Make UNWINDER_ARM depend on ld.bfd or ld.lld 11.0.0+ When linking aspeed_g5_defconfig with ld.lld 10.0.1, the following error occurs: ld.lld: error: .tmp_vmlinux.kallsyms1:(.ARM.exidx+0x34D98): relocation R_ARM_PREL31 out of range: 2135538592 is not in [-1073741824, 1073741823] This was resolved in ld.lld 11.0.0 but the minimum supported version of ld.lld for the kernel is 10.0.1. Prevent CONFIG_UNWINDER_ARM from being selected in this case so that the problematic sections cannot be created. Link: https://github.com/ClangBuiltLinux/linux/issues/732 Link: https://github.com/llvm/llvm-project/commit/48aebfc908ba7b9372aaa478a9c200789491096e Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com> Signed-off-by: Nathan Chancellor <nathan@...nel.org> --- arch/arm/Kconfig.debug | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 9e0b5e7f12af..64c1f8a46ab5 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -66,6 +66,8 @@ config UNWINDER_FRAME_POINTER config UNWINDER_ARM bool "ARM EABI stack unwinder" depends on AEABI && !FUNCTION_GRAPH_TRACER + # https://github.com/ClangBuiltLinux/linux/issues/732 + depends on !LD_IS_LLD || LLD_VERSION >= 110000 select ARM_UNWIND help This option enables stack unwinding support in the kernel base-commit: a38fd8748464831584a19438cbb3082b5a2dab15 -- 2.31.0.rc1
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